SharePoint List UnsupportedFileTypeError

Emmanuel Adegor
2 min readApr 11, 2023

SharePoint is a powerful collaboration platform that enables teams to share information, collaborate on documents, and manage projects efficiently. One of the core features of SharePoint is the ability to create custom lists, which can store a wide range of data types, including text, numbers, and dates.

However, when you try to update a SharePoint list column from multi-line text to single-line text, you may encounter an error message that says “UnsupportedFileTypeError”.

The reason for this error is that multi-line text in SharePoint is of type Enhanced Rich Text, which is not compatible with single-line text fields. Enhanced Rich Text fields are designed to support formatted text, images, and other media, while single-line text fields are intended to store plain text.

So, when you try to convert a multi-line text field to a single-line text field, SharePoint cannot make the conversion because the file type is not supported. This results in the UnsupportedFileTypeError message.

To reproduce the error:

  1. Go to your SharePoint list and click on “List Settings” in the Settings menu.
  2. Under “Columns,” click on the multi-line column you want to convert.
  3. Click on “Change Type” in the field properties.
  4. Choose “Single line of text” from the list of available types.
  5. Click “OK” to save the changes. You’ll see an error message that says “UnsupportedFileTypeError.”

To fix the error:

  1. Go to your SharePoint list and click on “List Settings” in the Settings menu.
  2. Under “Columns,” click on the multi-line column you want to convert.
  3. Update the multi-line text column type from Enhanced Rich Text to Plain Text.
  4. Click on “Change Type” in the field properties.
  5. Choose “Single line of text” from the list of available types.
  6. Click “OK” to save the changes.

You’ll no longer see an error message that says “UnsupportedFileTypeError.”

Issue resolved!!

Photo Credit: https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.imdb.com%2Ftitle%2Ftt1690953%2F&psig=AOvVaw33V4XMBQECmHmE11ZwT5mn&ust=1681262521909000&source=images&cd=vfe&ved=0CBAQjRxqFwoTCNDs8IzVoP4CFQAAAAAdAAAAABAE

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Emmanuel Adegor

SharePoint Developer | React JS | SPFX | SharePoint Administrator